ESR1 and metastatic malignant neoplasm in the lymph nodes: HSP70 immunoreactivity was significantly correlated with the stage (p = 0.0027), pathological T factor (p = 0.0029), lymph node metastasis (p = 0.0016), the histological grade (p < 0.0001), and the Ki67 labeling index (LI) (p = 0.0016), while it was negatively correlated with ER (p = 0.0060) and PR (p = 0.020).